Notation 7014

There is no 0 in the decimal notation in natural numbers, and there are even numbers or odd numbers, each at least once. Find the number of all k-digit natural numbers.

Correct answer:

p = 4^k
n = 5^k

Step-by-step explanation:

p: 2,4,6,8 n: 1,3,5,7,9 p=4k
n=5k



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